Wasn't it Charles C who wrote:
>Warp <war### [at] tagpovrayorg> wrote:
>> Ansgar <Tem### [at] gmxde> wrote:
>> > I'd like to define a background colour that just paints the background in
>> > the given colour but does *not* affect the scene, like being reflected in
>> > mirror materials. Can it be done?
>>
>>   Well, you could put a large inverted sphere of the specified color and
>> assign 'no_reflection' to it.
>>
>> --
>>                                                           - Warp
>
>
>You might also want ambient 1 on that large sphere to get the exact color.
>You aren't using radiosity are you?  I'm not sure what Warp meant by
>inverted.

Use the inverse (or hollow) keyword, otherwise it affects things like
media and fog.

-- 
Mike Williams
Gentleman of Leisure

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